Objective Systematic uncertainty study of valid chlorine measurement in chlorine disinfectant were made so as to improve quality control of valid chlorine measurement.

目的对含氯消毒剂中有效氯含量测量不确定度进行系统研究，为有效氯含量测定的质量控制提供依据。

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The paper researched on characters of NOM (nature organic matter) based on the fractionation of NOM, and studied the control of DBPs (disinfection by-products) by chloramine compared with chlorine.

在对天然有机物分类的基础上进行了水体中有机物的特性研究，并采用氯胺对不同特性有机物的氯化消毒副产物进行了控制研究。

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The control system takes the original water current capacity and the water extra chlorine density as the forward feed and feedback signal, using the PID algorithm control the chlorine quantity.

控制系统以原水流量为前馈和出厂水余氯浓度作为反馈信号，采用PID算法控制加氯量。

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According to the CDC, it takes less than a minute for E. coli to be inactivated if chlorine levels are adequate, about 16 minutes to control Hepatitis A virus, about 45 minutes to kill off the Giardia parasite and over 10 days for a Crypto parasite.

CNN: Yuck! What's in your pool water

The report said the hospital had made an "investment in measures to control legionella" including the introduction of a silver and copper ionisation disinfection system, to replace its chlorine dioxide one.

BBC: 'Legionella concerns' remain at Basildon hospital